A molding die, a lattice mask molding method, and a lattice mask

Abstract

The application discloses a forming die, a grating mask forming method and a grating mask, and solves the technical problem of glue overflow in the prior art grating mask injection molding. The forming die comprises a first half die provided with a first die surface and a first glue injection port, the edge of the first die surface is convex relative to the middle part to form a ring convex; a second half die provided with a second die surface, the second half die is movably arranged to switch between a first position and a second position; a third half die provided with a third die surface and a second glue injection port; when the second half die is located at the first position, the second half die and the first half die form a first mold cavity matched with the body having a ring recess, and the first glue injection port is communicated with the first mold cavity; when the second half die is located at the second position, the second half die and the body form a second mold cavity matched with the cover layer, and the second glue injection port is communicated with the second mold cavity. The forming die provided by the application reduces the deformation amount of the body in the injection molding process and avoids the glue overflow problem.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of vehicle grille panel forming, and particularly relates to a forming die, a grille cover forming method and a grille cover. BACKGROUND

[0002] The grille cover is assembled at the front end of the cab, and has a light-transmitting part and a light-shielding part. The light-transmitting part allows light to pass through, and the light-shielding part can serve as a shielding structure, such as a structure for preventing shrinkage or a structure for applying a reinforcing rib.

[0003] In the prior art, the grille cover is usually obtained by injection molding. However, since the length of the grille cover is about 1188 mm, the size is very large, and the edge position is a curved surface, overflow problems are prone to occur during injection molding. SUMMARY

[0004] To solve the technical problem of overflow during forming of a large-size curved grille cover, the present application provides a forming die, a grille cover forming method and a grille cover.

[0005] In a first aspect of the present application, a forming die is provided for forming a curved grille cover. The grille cover includes a body and an annular cover layer connected to the side edge of the body. The body is curved along both sides in the width direction of the vehicle body. The forming die includes:

[0006] a first half die provided with a first die surface and a first glue injection port. The edge of the first die surface is convex relative to the middle part to form a ring convexity corresponding to the position of the glue reinforcing rib;

[0007] a second half die provided with a second die surface. The second half die is movably arranged to switch between a first position and a second position;

[0008] a third half die provided with a third die surface and a second glue injection port;

[0009] When the second half die is in the first position, the second half die is combined with the first half die to form a first die cavity matching the body with the ring concave. The first glue injection port is connected to the first die cavity. When the second half die is in the second position, the second half die is combined with the body, and the body and the third die surface form a second die cavity matching the cover layer. The second glue injection port is connected to the second die cavity.

[0010] In some embodiments, the height of the ring convexity is 1.2-1.8 mm, and the distance between the top of the ring convexity and the second die surface is 1.6-3 mm.

[0011] In some embodiments, the width of the annular protrusion is 10 to 14 mm.

[0012] In some embodiments, the annular cover layer is provided with adhesive ribs, the distance between the third shaped surface and the annular recess is (2.7~3)×d, where d represents the thickness of the adhesive ribs; the distance between the third shaped surface and the body is 4~4.2mm.

[0013] In some embodiments, the body is bent along both sides of the vehicle width direction in a direction away from the center of curvature of the curved surface, and the end face of the third half-mold coincides with the end face of the bent portion of the body. Along the width direction of the vehicle, the overlap dimension between the end face of the third half-mold and the end face of the body is ≥3mm.

[0014] In some embodiments, the outer edge of the annular cover layer extends beyond the body, and the outer edge of the annular cover layer extends in a direction away from the center of curvature of the surface. The third half mold includes a mold core and a slider. The mold core has a first sub-surface and a second sub-surface. The first sub-surface and the second sub-surface are set at an acute angle. The slider has a third sub-surface corresponding to the position of the second sub-surface. The middle part of the third sub-surface protrudes. The edge of the body, the first sub-surface, the second sub-surface, and the third sub-surface together form the secondary cavity.

[0015] In a second aspect of this application, a method for forming a grid face mask is provided, applicable to the forming mold of the first aspect, characterized in that the method for manufacturing the grid face mask includes the following steps:

[0016] The first half mold and the second half mold are joined together to form a primary cavity. Translucent material is then injected into the primary cavity through a primary injection port to form the body.

[0017] The first half-mold is removed, and the second half-mold drives the body to switch from the first position to the second position, so that the second half-mold and the body together form a secondary cavity. The opaque material is injected into the secondary cavity through the secondary injection port to form the grid mask.

[0018] In some embodiments, during the single injection molding process, the injection pressure is 140–155 MPa, the injection rate is 30–40 mm / s, and the temperature of the first and second half molds is 95–105 °C.

[0019] In some embodiments, during the secondary injection molding, the injection pressure is 130-140 MPa, the injection rate is 30-40 mm / s, the temperature of the second and third half molds is 95-105°C, the holding pressure is 6.5-7.5 MPa, and the holding time is 3-7 s.

[0020] In a third aspect of this application, a grid face mask is provided, which is formed using the molding die of the first aspect, or formed using the grid face mask forming method of the second aspect.

[0021] According to the molding die provided in the embodiments of this application, it includes three half-molds: a first half-mold, a second half-mold, and a third half-mold. The first half-mold has a first surface and a primary injection port. The edge of the first surface protrudes relative to the middle portion to form an annular protrusion, which corresponds to the position of the adhesive coating rib. The second half-mold has a second surface and is movably configured to switch between a first position and a second position. The third half-mold has a third surface and a secondary injection port. When the second half-mold is in the first position, it closes with the first half-mold, so that the first and second surfaces together form a primary cavity that matches the body with an annular recess, and the primary injection port communicates with the primary cavity. When the second half-mold is in the second position, it closes with the body, and the body and the third surface together form a secondary cavity that matches the cover layer, and the secondary injection port communicates with the secondary cavity.

[0022] With the second half mold in the first position, the second half mold is closed with the first half mold so that the first and second surfaces enclose a primary cavity that matches the body with the annular recess. The primary injection port is connected to the primary cavity, so that a light-transmitting material can be injected into the primary cavity through the primary injection port to form a body with the annular recess. With the second half mold in the second position, the second half mold is closed with the body, and the body and the third surface enclose a secondary cavity that matches the covering layer. The secondary injection port is connected to the secondary cavity, so that an opaque material, i.e., a light-blocking material, can be injected into the secondary cavity through the secondary injection port to form an annular light-blocking layer, thereby completing the injection molding of the grille cover.

[0023] Because the thickness of the central part of the grid mask body formed by the molding die of this application is the same as the thickness of the finished light-emitting grid, and the thickness of the edge part is thinner than that of the central part, less light-transmitting material flows into the edge part during the first injection molding process. Since the edge part is close to the two curved surfaces of the body, the stress concentration at the two curved surfaces of the body can be reduced, thereby reducing the risk of deformation of the body at the two curved surfaces and thus reducing the risk of glue overflow during the second injection process.

[0024] Even if the body deforms due to internal stress after injection molding, the body is thinner at the edges and can be easily corrected to the target shape under the action of the third half mold. The thicker annular cover layer can also offset some of the deformation of the thinner body, making the molded grille cover close to the target size.

[0025] In addition, the thinning at the edges of the body means that the thickness of the annular cover layer at the curved surfaces on both sides will increase, and the adhesive reinforcement corresponds to the annular protrusion, meaning that the annular cover layer is thickened at the adhesive reinforcement position. This can improve the connection strength between the annular cover layer and the adhesive reinforcement. Attached Figure Description

[0026] Figure 1 A schematic diagram of the structure of the grille mask in one or more embodiments of this application is shown.

[0027] Figure 2 A schematic diagram of the structure of the body of the grille mask and the annular covering layer in one or more embodiments of this application is shown.

[0028] Figure 3 A schematic diagram of the molding die mechanism is shown in one or more embodiments of this application.

[0029] Figure 4 It shows Figure 3 A schematic diagram of the primary cavity structure of the molding die.

[0030] Figure 5 It shows Figure 3 A schematic diagram of the secondary cavity structure of the molding die.

[0031] Figure 6 It shows Figure 3 A magnified view of a portion of point A in the middle.

[0032] Figure 7 It shows Figure 3 A magnified view of a section at point B in the middle.

[0033] Explanation of reference numerals in the attached figures:

[0034] 10-First half mold, 11-First injection port, 12-Ring protrusion, 13-First mold surface, 14-Half mold body, 15-Clamping block.

[0035] 20 - Second half mold, 21 - Second surface. 30 - Third half mold, 31 - Secondary injection port, 32 - Third surface, 33 - Mold core, 331 - First sub-surface, 332 - Second sub-surface, 34 - Slider, 341 - Third sub-surface, 342 - Protrusion.

[0036] 60 - Primary cavity, 70 - Secondary cavity;

[0037] 80-Grid mask, 81-Body, 811-Annular recess, 82-Annular covering layer, 83-First curved surface, 84-Second curved surface. Detailed Implementation

[0038] To enable those skilled in the art to more clearly understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] According to a first aspect of this application, a molding die is provided for molding a large-size curved grid mask 80, which can reduce the risk of deformation during the molding process of the grid mask 80 and reduce the amount of excess adhesive.

[0040] Please see Figure 1 as well as Figure 2 The curved grille cover 80 has an axisymmetric structure. Both sides of the grille cover 80 are curved surfaces along its length, which is also the width of the vehicle body. The curvature center of the curved surfaces is close to the outside of the vehicle. The middle part of the grille cover 80 is also curved, and the curvature center of the middle curved surface is close to the inside of the vehicle. In other words, the curvature centers of the middle curved surface and the two side curved surfaces are located on both sides of the grille cover 80. When viewed from above, it presents a W shape. This forms a large-size multi-curved grille cover 80 with a middle curved surface and two side curved surfaces. For ease of explanation, the middle curved surface can be named the first curved surface 83, and the two side curved surfaces can be named the second curved surface 84. The curvature of the two side curved surfaces, namely the second curved surface 84, is 0.013 to 0.035.

[0041] Please see Figure 1 as well as Figure 2 The grille cover 80 includes a body 81 and an annular covering layer 82. The annular covering layer 82 covers the side edge of the body 81 near the interior of the vehicle, that is, near the center of curvature of the first curved surface 83. The annular covering layer 82 can be made of an opaque material to cover internal structures such as anti-shrinkage structures (dog kennels) and adhesive reinforcement. The body 81 can be made of a light-transmitting material to allow light to pass through, thus enabling the luminous grille assembly to present lighting effects in scenarios such as welcoming and bidding farewell to guests.

[0042] The main body 81 bends along both sides of the vehicle width direction toward the curvature center away from the second curved surface 84, that is, it bends toward the inside of the vehicle. The edge of the annular cover layer 82 extends out of the main body 81, and the part of the annular cover layer 82 extending out of the main body 81 extends toward the curvature center away from the two curved surfaces, forming a connection structure that cooperates with the grille mounting structure.

[0043] Please see Figure 3 , Figure 4 as well as Figure 5The molding die provided in this application includes three half-molds, namely a first half-mold 10, a second half-mold 20 and a third half-mold 30. The first half-mold 10 is provided with a first surface 13 and a primary injection port 11. The edge of the first surface 13 protrudes relative to the middle part to form an annular protrusion 12, which corresponds to the position of the glue-applying rib. The second half-mold 20 is provided with a second surface 21 and is movably configured to switch between a first position and a second position. The third half-mold 30 is provided with a third surface 32 and a secondary injection port 31.

[0044] When the second half-mold 20 is in the first position, the second half-mold 20 and the first half-mold 10 are closed, so that the first surface 13 and the second surface 21 enclose a primary cavity 60 that matches the body 81 with the annular recess 811. The primary injection port 11 is connected to the primary cavity 60, so that light-transmitting material can be injected into the primary cavity 60 through the primary injection port 11 to form a body 81 with the annular recess 811. That is to say, the thickness of the middle part of the body 81 is the same as the thickness of the finished light-emitting grid, and the thickness of the edge part is thinner than that of the middle part. Thus, during the primary injection molding process, the material flowing into the edge part... With less light-transmitting material and the edges being close to the curved surfaces on both sides of the body 81, stress concentration at these curved surfaces is reduced, thus lowering the risk of deformation and overflow during secondary injection molding. Even if deformation occurs due to internal stress after injection molding, the thinner edge allows for easy correction to the target shape under the action of the third half-mold 30. The thicker annular cover layer 82 can also offset some of the deformation of the thinner body 81, ensuring the molded grille cover 80 closely matches the target size. Furthermore, the thinner edge of the body 81 means the increased thickness of the annular cover layer 82 at the curved surfaces, and the thickening of the annular cover layer 82 at the position of the adhesive rib corresponding to the annular protrusion 12, thus improving the connection strength between the annular cover layer 82 and the adhesive rib.

[0045] With the second half mold 20 in the second position, the second half mold 20 and the body 81 are closed. The body 81 and the third surface 32 together form a secondary cavity 70 that matches the covering layer. The secondary injection port 31 is connected to the secondary cavity 70. Therefore, opaque material, i.e., light-shielding material, can be injected into the secondary cavity 70 through the secondary injection port 31 to form an annular light-shielding layer, thereby completing the injection molding of the grille cover 80.

[0046] In some embodiments, the height of the annular protrusion 12 can be 1.2–1.8 mm, meaning the depth of the annular recess 811 of the formed body 81 is 1.2–1.8 mm, such as 1.3 mm, 1.4 mm, 1.5 mm, 1.6 mm, or 1.7 mm. If the height of the annular protrusion 12 is too high, the thickness of the body 81 at the annular recess 811 position may be too small, potentially leading to uneven material filling. If the height of the annular protrusion 12 is too small, it will reduce the effectiveness of preventing adhesive overflow. In other embodiments, the height of the annular protrusion 12 can also be 1.9 mm or 1.1 mm, which can still reduce the risk of deformation of the curved surfaces on both sides, thereby reducing the adhesive overflow problem.

[0047] In some embodiments, the distance between the top of the annular protrusion 12 and the second surface 21 can be 1.6–3 mm, meaning the thickness of the body 81 at the annular recess 811 is 1.6–3 mm, such as 1.7 mm, 1.8 mm, 1.9 mm, 2.0 mm, 2.1 mm, 2.2 mm, 2.3 mm, 2.5 mm, 2.6 mm, 2.8 mm, or 2.9 mm, ensuring the filling effect of the material. In other embodiments, the distance between the top of the annular protrusion 12 and the second surface 21 can be 1.5 mm or 3.1 mm.

[0048] In some embodiments, the width of the annular protrusion 12 can be 10-14 mm, meaning the radial radius difference of the annular protrusion 12 can be 10-14 mm, and the width of the annular recess 811 on the body 81 can be 10-14 mm, such as 11 mm, 12 mm, or 13 mm. If the width of the annular protrusion 12 is too large, there will be too little material in the body 81 at that location, which may exacerbate the deformation of the body 81 at the side curved surface to some extent. If the width of the annular protrusion 12 is too small, it may reduce the effect of suppressing deformation. In other embodiments, the width of the annular protrusion 12 can also be 15 mm or 9 mm, which can also achieve a certain effect of suppressing the deformation of the two side curved surfaces.

[0049] In some embodiments, the distance between the third surface 32 and the annular recess 811 can be (2.7~3)×d, where d represents the thickness of the adhesive-coating rib. That is, the thickness of the annular covering layer 82 in the formed grid cover 80 at the adhesive-coating rib can be (2.7~3)×d, for example, 2.8d or 2.9d, thus ensuring the connection strength between the adhesive-coating rib and the annular covering layer 82. Of course, in other embodiments, the distance between the third surface 32 and the annular recess 811 can also be 3.2d, still ensuring the connection strength between the adhesive-coating rib and the annular covering layer 82.

[0050] In some embodiments, the distance between the third surface 32 and the body 81 can be 4 to 4.2 mm, meaning the conventional thickness of the annular cover layer 82 can be 4 to 4.2 mm, for example, 4.1 mm. This thickness is less than the thickness of the annular cover layer 82 at the adhesive application rib. In other embodiments, the distance between the third surface 32 and the body 81, which is also the conventional thickness of the annular cover layer 82, can be 4.3 mm or 3.9 mm.

[0051] Please see Figure 6 The first half-mold 10 includes a half-mold body 14 and a clamping block 15. The half-mold body 14 and the clamping block 15 together provide a first profile 13. When the first half-mold 10 separates from the second half-mold 20, as the second half-mold 20 moves away from the first half-mold 10, the clamping block 15 moves away from the half-mold body 14, so that both the clamping block 15 and the half-mold 10 are disengaged from the body 81. The structure for separating the clamping block 15 relative to the half-mold body 14 during the mold parting process is prior art. For example, an inclined rod is provided on the second half-mold 20, and a guide hole is provided on the clamping block 15. When the second half-mold 20 reciprocates along the first direction, the inclined rod can extend into or leave the guide hole, so that the clamping block 15 moves closer to or away from the half-mold body 14. For more details, please refer to the prior art disclosure, which will not be elaborated here.

[0052] In some embodiments, the primary injection port 11 is located in the central part of the primary cavity 60, coinciding with the center lines of the length and height of the grille cover 80, to ensure the consistency of the curved surfaces on both sides of the body 81, reduce weld lines, and reduce internal stress and component deformation. The sealing height H1 of the clamping block 15 at the end of the body 81 along the length direction is ≥2.0mm to ensure that the components can be effectively clamped and that product crushing will not occur. The parting crimping width W1 of the clamping block 15 at the end of the body 81 along the length direction is ≥0.9mm to ensure that the body of the grille cover is clamped. There are two clamping blocks 15, which are located on both sides of the grille along its own length direction. The two clamping blocks 15 can move in opposite directions along the parting surface to demold the body 81 from the first half mold 10.

[0053] The second half-mold 20 is a movable half-mold, which can switch between the first position and the second position. The first half-mold 10 and the third half-mold 30 are fixed molds and their positions remain unchanged. In a specific implementation, the first half-mold 10, the second half-mold 20, and the third half-mold 30 can be arranged sequentially along a first direction, which can be vertical or horizontal. The first half-mold 10 and the third half-mold 30 can be fixed molds. The second half-mold 20 is located between the first half-mold 10 and the third half-mold 30. The second half-mold 20 can rotate around itself and can reciprocate along the first direction. In this way, after one injection molding is completed, the first half-mold 10 and the second half-mold 20 can be opened by moving away from the first half-mold 10 along the first direction through the second half-mold 20. After the mold is opened, the body 81 formed by one injection molding will stick to the second half-mold 20 and move to the second position with the second half-mold 20. The second half-mold 20 can rotate 180° around itself, carrying the main body 81, so that the main body 81 faces the third half-mold 30, and then moves closer to the third half-mold 30 along the first direction until it reaches the second position, thereby realizing the mold closing of the main body 81 and the third half-mold 30. The second half-mold 20 moves away from the third half-mold 30 along the first direction to realize the mold opening of the second half-mold 20 and the third half-mold 30. The reciprocating movement and rotation of the second half-mold 20 can be realized by a drive mechanism, which may include a hydraulic cylinder and a motor. The drive mechanism is prior art, and more details of it can be found in prior art disclosures, which will not be elaborated here. In some embodiments, the third half mold 30 can reciprocate along the first direction to approach or move away from the second half mold 20. The second half mold 20 is provided with two second surfaces 21 arranged opposite to each other along the first direction, so that one of the second surfaces 21 of the second half mold 20 can be combined with the first half mold 10 to form a primary cavity 60, and the other second surface 21, along with the body 81, can be combined with the third half mold 30 to form a secondary cavity 70. The primary injection and secondary injection are performed simultaneously, improving molding efficiency.

[0054] Please see Figure 7 The third half mold 30 includes a mold core 33 and a slider 34. The mold core 33 has a first sub-surface 331 and a second sub-surface 332, which are set at an acute angle. The slider 34 has a third sub-surface 341 corresponding to the position of the second sub-surface 332. The middle part of the third sub-surface 341 protrudes to form a protrusion 342. The edge of the body 81, the first sub-surface 331, the second sub-surface 332 and the third sub-surface 341 together form a secondary cavity 70. That is to say, the secondary cavity 70 forms a depression at the position corresponding to the protrusion in the middle of the third sub-surface 341. In this way, the part of the injection-molded annular cover layer 82 that extends out of the body 81 will form a groove. This can increase the contact area between the third sub-surface 341 and the annular cover layer 82, avoid the annular cover layer 82 from breaking, and at the same time, the groove of the annular cover layer 82 can also be used for a snap-fit ​​connection structure.

[0055] During the demolding process of the second half mold 20 and the third half mold 30, the third half mold 30 moves away from the second half mold 20, while the slider 34 moves away from the mold core 33 to the side, thereby achieving the demolding of the grid cover 80. Regarding the structure for the slider 34 to move closer to or further away from the mold core 33, the slider 34 is also provided with a guide hole. The tilting rod of the second half mold 20 can extend into or leave the guide hole of the slider 34, thereby enabling the slider 34 to move closer to or further away from the mold core 33. This part is prior art, and more details can be found in prior art disclosures, which will not be elaborated here.

[0056] In some embodiments, please continue reading Figure 7 The end face of the third half mold 30 coincides with the bent portion of the main body 81. Along the width direction of the vehicle, the overlap dimension w2 between the end face of the third half mold 30 and the main body 81 is ≥3mm, which is also the overlap dimension w2 between the end face of the slider 34 and the main body 81. This can also be referred to as the sealing width w2 ≥3mm, such as 4mm, 5mm, or 6mm. This allows the third half mold 30 to apply pressure towards the outside of the vehicle onto the main body 81, increasing the contact area with the end face of the main body 81 and preventing the main body 81 from being crushed. In other embodiments, the overlap dimension between the end face of the third half mold 30 and the main body 81 can also be 2mm. The sealing height H2 of the slider 34 is ≥2mm, such as 3mm, 4mm, or 5mm.

[0057] In some embodiments, please refer to Figure 5 Multiple secondary injection ports 31 are provided, and the multiple secondary injection ports 31 are distributed at intervals on the edge of the body 81. That is, the multiple secondary injection ports 31 are distributed at intervals along the circumference of the annular secondary cavity 70 to improve the uniformity of each position of the annular cover layer 82 and improve the injection molding efficiency.

[0058] A second aspect of this application provides a method for manufacturing a grid mask 80, applicable to the molding die of any embodiment of the first aspect.

[0059] The method for manufacturing the grille cover 80 of this application includes the following steps:

[0060] S1. The first half mold 10 and the second half mold 20 are joined together to form a primary cavity 60. Transparent material is injected into the primary cavity 60 through the primary injection port 11 to form the body 81.

[0061] S2. Remove the first half mold 10, and the second half mold 20 drives the body 81 to switch from the first position to the second position, so that the second half mold 20 and the body 81 surround the secondary cavity 70. The opaque material is injected into the secondary cavity 70 through the secondary injection port 31 to form the grid cover 80.

[0062] The grille cover 80 is obtained by injection molding in two stages. The first injection molding forms the light-transmitting body 81, and the second injection molding forms the opaque annular cover layer 82. Separate injection molding can meet the injection molding requirements of two colors, namely transparent and opaque materials, and can also reduce the internal stress of the grille cover 80 and reduce its deformation. However, for large-sized and multi-curved grille covers 80, the injection molding process is prone to deformation at the curved surfaces on both sides. By controlling the thickness of the primary cavity 60 at the curved surfaces on both sides, the feed amount can be reduced, thereby reducing stress concentration and reducing the deformation of the body 81. At the same time, the thicker annular cover layer 82 can also correct the deformation, making the grille cover 80 closer to the target size and improving the manufacturing accuracy of the grille cover 80.

[0063] In some embodiments, during the single injection molding process, the injection pressure is 140–155 MPa, for example, 141 MPa, 143 MPa, 145 MPa, 148 MPa, 150 MPa, 152 MPa, 153 MPa, or 154 MPa. The injection rate is 30–40 mm / s, for example, 31 mm / s, 33 mm / s, 35 mm / s, 36 mm / s, 37 mm / s, 38 mm / s, or 39 mm / s. The temperature of the first half-mold 10 and the second half-mold 20 is 95–105°C, for example, 96°C, 97°C, 98°C, 99°C, 100°C, 101°C, 102°C, 103°C, or 104°C.

[0064] In addition, the baking temperature of the transparent material is 290-300℃, such as 293℃, 295℃ or 298℃, etc., and then it is injected into the primary cavity 60 after baking.

[0065] In some embodiments, during secondary injection molding, the injection pressure is 13-14 MPa, such as 13.5 MPa, 13.7 MPa, 13.8 MPa, or 13.9 MPa, and the injection rate is 30-40 mm / s, such as 31 mm / s, 33 mm / s, 35 mm / s, 36 mm / s, 37 mm / s, 38 mm / s, or 39 mm / s. The temperatures of the second half-mold 20 and the third half-mold 30 are 95–105℃, such as 96℃, 97℃, 98℃, 99℃, 100℃, 101℃, 102℃, 103℃, or 104℃, etc. The holding pressure is 6.5–7.5MPa, such as 6.6MPa, 6.7MPa, 6.8MPa, 6.9MPa, 7.0MPa, 7.1MPa, 7.2MPa, 7.3MPa, or 7.4MPa, etc., and the holding time is 3–7s, such as 4s, 5s, or 6s, etc.

[0066] According to a third aspect of this application, a grid mask 80 is provided, which is formed by molding a mold according to any embodiment of the first aspect, or by molding a grid mask 80 according to the second aspect.

[0067] The grille cover 80 also includes a coating, a laser-engraved pattern, and a protective layer. The coating covers the side of the grille cover 80 closest to the outside of the vehicle, while the laser-engraved pattern and the protective layer cover the body 81 of the grille cover 80 in sequence and are located within the annular cover layer 82.

[0068] The coating can be a hardened coating, or the coating can include a transparent primer layer, a body color paint layer and a protective layer arranged sequentially from the body 81 to the outside. The transparent primer layer can increase the adhesion of the paint, and the protective layer can increase the weather resistance and mechanical wear resistance of the parts.

[0069] Laser engraving patterns can be formed by first spraying a masking primer onto the part of the body 81 located within the annular masking layer 82, and then processing the light-transmitting area.

[0070] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0071] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0072] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0073] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0074] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A forming mold for forming a curved lattice face shield, characterized by, The grille mask comprises a body and a ring-shaped cover layer connected to the side edges of the body, the body is curved along the two sides of the vehicle width direction, the thickness of the middle part of the body is the same as the thickness of the finished light-emitting grille, and the thickness of the edge part is thinner than the middle part; the ring-shaped cover layer is provided with a glue coating rib, and the forming mold comprises: a first half mold provided with a first profile and a first glue injection port, the edge of the first profile is convex relative to the middle part to form a ring convex, and the ring convex corresponds to the position of the glue coating rib; a second half mold provided with a second profile, the second half mold is movably arranged to switch between a first position and a second position; a third half mold provided with a third profile and a second glue injection port; wherein, when the second half mold is in the first position, the second half mold is combined with the first half mold to make the first profile and the second profile form a first cavity matched with the body having a ring concave, and the first glue injection port is communicated with the first cavity; when the second half mold is in the second position, the second half mold is combined with the body, and the body and the third profile form a second cavity matched with the cover layer, and the second glue injection port is communicated with the second cavity.

2. The forming mold of claim 1, wherein The height of the ring convex is 1.2-1.8mm, and the distance between the top of the ring convex and the second profile is 1.6-3mm.

3. The forming mold of claim 1, wherein The width of the ring convex is 10-14mm.

4. The forming mold of claim 1, wherein The distance between the third profile and the ring concave is (2.7-3)×d, wherein d represents the thickness of the glue coating rib; and the distance between the third profile and the body is 4-4.2mm.

5. The lattice mask forming mold according to any one of claims 1 to 4, characterized by The two sides of the body along the vehicle width direction are bent away from the curvature center of the curved surface, the end surface of the third half mold coincides with the bent part of the body, and the end surface coincidence size of the third half mold and the body along the width direction of the vehicle is ≥3mm.

6. The lattice mask forming mold according to any one of claims 1 to 4, characterized by The outer edge of the ring-shaped cover layer extends beyond the body, and the outer edge of the ring-shaped cover layer extends away from the curvature center of the curved surface, the third half mold comprises a mold core and a slider, the mold core is provided with a first sub-profile and a second sub-profile, the first sub-profile and the second sub-profile are arranged at an acute angle, the slider is provided with a third sub-profile corresponding to the position of the second sub-profile, the middle part of the third sub-profile is convex, and the edge of the body, the first sub-profile, the second sub-profile and the third sub-profile form the second cavity.

7. A method of forming a lattice mask, which is suitable for the forming mold according to any one of claims 1 to 6, characterized by, The grille mask manufacturing method comprises the following steps: combining the first half mold and the second half mold to form a first cavity, injecting a light-transmitting material into the first cavity through a first glue injection port to form a body; removing the first half mold, switching the second half mold and the body from the first position to the second position to make the second half mold and the body form a second cavity, and injecting a non-light-transmitting material into the second cavity through a second glue injection port to form the grille mask.

8. The lattice veil forming method of claim 7, wherein, In the first injection molding, the injection pressure is 140-155MPa, the injection rate is 30-40mm / s, and the temperature of the first half mold and the second half mold is 95-105℃.

9. The lattice veil forming method of claim 7, wherein, In the over-molding, the injection pressure is 130-140 MPa, the injection rate is 30-40 mm / s, the temperature of the second mold half and the third mold half is 95-105℃, the holding pressure is 6.5-7.5 MPa, and the holding time is 3-7 s.

10. A lattice mask characterized in that, obtained by using the molding die according to any one of claims 1-6, or obtained by using the grating mask molding method according to any one of claims 7-9.

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